Stove construction



June 6,1939. A J YEAGER 2,161,118

STOVE CONSTRUCTION Filed Feb. 15, 1937 4 sheets-sheet 1 'June 6,1939. A YEA'GHQ 2,161,118`

STOVE CONSTRUCTION June 6, 1939. A. J. YEAGER sTovE cons'rnucmou Filed Feb. 1s, 1937 4 Sheets-Sheet 3 @eff 4%" QQ QN@ nu um n@ /mn w Y m A. J. YEAGr-:R

' sTovE CONSTRUCTION June 6, 1939.

4 shets-sheet 4 Filed Feb. 15, 1937 UNITED STATES PATENT OFFICE Anton J. Yeager, VWisconsin Rapids, Wis., assignor to Prentiss-Wabers Products Co., Wisconsin Rapids, Wis., a corporation of Wisconsin `pplication February 13, 1937,Serial No. 125,566

3 Claims.

My invention relates to kerosene stoves; and

has particular reference and fuel assembly for kerosene stoves whereby a.

to a burner, Vgenerator fuel in vapor form from kerosene is produced and burned through the burners attached to the stove. Another object of my invention is the provision lof a kerosene stove having a generator which converts kerosene into a. vapor with the proper ad- ,mixture of air therein to produce a combustible mixture in vapor form, which is conducted to appropriate burners and there consumed v for the purpose'of producing heat for various domestic purposes, such as cooking, baking,` and the like.

Another and further o bject of my invention is the provision of a generator and burner assembly having means whereby the tubes are preheated through the use of a highly volatile fuel, such as gasoline or the like, an suflicient heating the ope d after'this initial and rator, by merely shifting a control valve on the fuel tank, closes the gasoline supply to the generator and causes kerosene to be forced through apreheater tube and generator tube Where the kerosene is converted from its fluid condition to vapor, and into the gener.

ator, into which an appropriate quantity of primary air for combustion lpurposes is admitted and mixed with the Vaporized kerosene, thusv forming a combustible mixture which is conducted to the burners where combustion takes place upon being ignited at the burners in any appropriate manner.

Another and further-o bject of my invention is the provision of a kerosene' stove which is substantially automatic in it s operation in that upon matically ignited, these ignited by the operator,

burners being on the generator and under the generator tube. After a sufficient irne has elapsed to allow the preheater tubes and generat or to become sufliciently heated, the operator, by a single shift of the valve control handle on the pressure fuel tank, closes the valve leading from the fuel tank through which the gasoline passes, thereby shutting off the gasoline and at the same operation opens a valve supplying kerosene to the preheater and f generator tubes into the generator where the Vaporized kerosene is mixed with the proper quantityA of air and conveyed to the master burner where it becomes ignited and ,combustion takes place. 55

Another and further o bject. of my invention is the provision of "suitable safety means in connection with the operation of the stovewhereby.

tubes are sulciently heated to convert the kerosene into vapor, the kerosene will not be permitted to flow into the preheater tubes. Its passage through a thermostatically controlled valve is prevented unless the thermostatic valve is opened by sufficient preheating of the generator tube, thereby preventing the flow of kerosene in liquid form into the generator, which' might result in disastrous res or the like, if any quantity of kerosene should flow into the generator.

These and other objects of my invention will .be more fully and better understood by reference to the accompanying ,sheets of drawings, in which- Figure 1 is a plan view of the generator manifold, burner assembly and fuel tank of my improved invention;

Figure 2 is a partial side elevation of the parts shown in Figure 1;

yFigure 3 is an end view of a section of the fuel tank and valve controlling the flow of fuel therefrom; e

Figure 4 is avertical sectional View on line 4-4 of Figure 3;

VFigure 5 is a vertical sectional view on line 5-5 of Figure 4; 1

`Figure 6 is a longitudinal sectional view of the generator tube and preheater tube;

Figure 7 is an enlarged sectional detail of. the discharge end of the generator tube on line I-J of Figurev;

Figure 8A is a sectional view on line Il-IiV of Figure 6: and

.Figure 9 isa cross sectional view on' line 9-9 of Figure 6. 'I

Referring now specifically to the drawings, and in which like reference characters refer to like parts throughout, a mixing tube I is provided which` is cast integral with a manifold II, the mixing tube and manifold being hollow to allow the passage of the -fuel therethrough. The mix- Ving tube has a receptacleportion I2 on the lower side thereof, within which liquid fuel, condensation and the like, may` collect. A drain plug I3 isV provided which may be used, if necessary, to re- 'move this material. The mixing tube has a U- shaped extension Il` at-one end thereof on the end of which a head I is secured and to which a'generator tube I6 is connected in axial alignment with the intake end of the curved end I4 of the mixing tube I0. The head I5 has extensions I1 and I8. on each side thereof to which are connected air inlet pipes I9, I9, having shutters `the openings in the inlet pipes I9 can be controlled for the purpose of allowing primary air to enter the mixing tube I8.

On the upper side of the mixing tube III, adjacent its connection to the manifold II, is a flattened, stepped portion 2|, having openings in the upper side thereof within which perforate lava grids 22, 22 are inserted, with a similar grid 22 being inserted in the upper side of the manifold II. The grid in the manifold II and the other grids form heater burners for the purpose of heating the generator tube I6 and preheater tube. these grids being placed directly underneath the generator tube I6.

The generator tube I6 extends forwardly of l the intake end of the mixing tube Ill, its front end supported by a washer 23 mounted in the upper end of the vertical portion of a. bracket 24, this bracket having leg portions which are formed integral with the manifold II and extend forwardly therefrom. The generator tube I6 `has a stem 25 extending longitudinally thereof, with a packing nut 26 being provided in threaded engagement with the outer end of the generator tube I6, with the usual packing being provided, by means of which a tight joint is formed around the stem 25. The usual handle 21 is provided on the outer end of the stem 25, and-on the inner end of the stem 25 4is a needle valve 28 which extends into a discharge port in a tip 29 threaded into the end of the generator tube I6 and which extends into the intake end of the mixing tube I0.

The end of the stem 25 adjacent the discharge end of the generator tube I6 has an inclined portion 30 formed thereon, with a valve seat 3| being formed adjacent the discharge port 32 at the end of the generator tube I6. The forward end 33 of the stem 25 is threaded and coacts with an internally threaded portion 34 on the inner bore of the generator tube I6 so that rotation of the stem 25 moves the stem 25 longitudinally of the generator tube, thereby opening and closing the valve at the end thereof and also the needle valve during the operation of the device.

A channel 35 is formed adjacent the discharge end of the stem 25, through which the vaporized fuel passes before entering the port 32. A coil spring 36 is placed around the stem 25, forming a spiral passage which extends from one end of the generator tube to the other so that the fuel entering the generator tube follows this spiral passage, thereby causing all of the fuel to remain adjacent the wall of the generator tube and also materially lengthening its passage through the generator tube so that it is retained in the generator tube for a longer period of time so that it may be thoroughly vaporized. The spring at its forward end seats against the shoulder 31 formed in the generator tube, while at the rear end it is seated against a Washer 38 fixed to the generator tube.

A preheater tube 39 is provided which extends parallel with the generator tube I6 and is connected thereto at 40, with a port 4I connecting the passage in the generator tube I6 and the preheater tube 39. A threaded plug 4Ia is provided having a stem 4Ib thereon around which a coil spring 4Ic extends for the length of Athe preheater tube 39, thus lengthening the travel of the fuel entering the generator through the preheater tube 39. A fuel pipe 42 is provided, one end of which is connected to the preheater tube 39 and the other end to a thermostatic Valve 43 (described and claimed in Patent No. 2,028,372), which is mounted on the lower portion of the bracket 24. The preheater tube 39 extends alongside the generator tube and in parallel relation therewith adjacent the heater burners, and from which, during the operation of the stove, heat is received for the purpose of preheating the fuel before it enters the generator tube I6.

At one end of the manifold II is mounted a master burner 44, admission of the combustible mixture-thereto being controlled by the usual valve operated by a stem 45. Leading from the manifold Il are tubes 46, 46 on which burners, such as 41, are mounted in the usual way, the admission of fuel from the manifold being controlled by valves to which stems 48, 48 are connected, with the usual valve handles mounted thereon at the outer ends thereof in the usual manner.

Secured to the upper side of the manifold I I by means of screws 49, 49, is aY shield 50 generally Arectangular in cross section, and open at its under side, Within which portions of the generator tube I6 and preheater tube 39 extend. This shield 58 has outwardly extending flanges thereon 4through which the screws 49, 49 extend which hold the shield in position on the manifold II. In effect the shield forms a heat retaining member and assists in distributing the heat generated from the heater burners 22, and assists in heating the generator tube I6 and preheater tube 39. Perforations 5I, 5I are formed in the shield 50 near the upper side of the side walls, which allow some of the products of combustion from the heater burners to escape to the atmosphere. Mounted in the shield 50`is a flash tube 52, one end of which extends upwardly toward and adjacent to the master burner 44 and the other end is adjacent the outermost of the heater burners, and which, in effect, forms a pilot light for the assembly. K Y

Extending from the thermostatic valve 43 in the axial end thereof, is a fuel conduit 53 which is connectedto an outlet 54 of a double valve4 55. A gasoline conduit 56 is provided which leads from a connecting member 51 mounted on the generator tube I6 near the outer end thereof to an outlet 58 on valve 55.

A fuel tank 59 is provided which has a division Wall 60 therein and extending thereacross, by means of which the fuel ta-nk is divided into two compartments 6I and 62, respectively, the compartment 6I being adapted to contain kerosene for use as fuel in the operation of the stove, and compartment 62 being adapted vto contain gasoline or some other highly volatile fuel for the purpose of initiating combustion in the stove. An attachment 63 for an air pump is provided, by means of which air may be pumped into the fuel tank 59, with an opening 64 being provided in the wall 60 near the upper side thereof by means `of which the pressure in each of the compartments 6I and 62 is equalized. Fuel openings are provided in the tank 59 which are closed by means of plugs 65, 65, while a pressure gauge 66 is provided to indicate to the operator the pressure of the air in the tank. 59.

The control valve 55 consists of a body member 61 having a gasoline inlet pipe 68 connected thereto, which is connected to a gasoline fuel tube 69 extending substantially to the bottom of the compartment 62 and through which gasoline passes through a passage 10 into a valve chamber 1I formed in the body 61, within which a valve member 12 is mounted having a needle point therein which is adapted toA open'and close a port 13 leading from the passage 10 into the valve chamber 1I. A coil spring 12a is provided which encircles the needle point on the valve member 12 and normally exerts its'force in a direction to open the port 13. The chamber ,1I has the gasoline outlet 58 leading therefrom, with the gasoline supply4 conduit 56 beingconnected by a nipple to the valve body 61 at this point, and through which gasoline is forced into the outer end of the generator tube |6, as will be more fully described hereinafter.

In the upper portion of the valve body 61 a threaded plug 14y is inserted underneath which a diaphragm is placed. The plug 14 has a plunger 16 extending therein having a head on the lower end thereof, with a coiled expansion 59 and to which a fuel tube 18a isconnected;

the fuel tube leading to a port 19 which opens into a chamber 8,0 formed in the valve body, and within Which.a valve member 8'I is mounted.

vThe valve member 8| has a needle portion at the lower end thereof around which a coil sprng 82 is secured, this needle portion of the valve member serving to open and close the port 19 through which the kerosene from tank59 passes. A port 83 passes through' the outlet v54 of the valve body 55 and `connects with the fuel pipe 53 leading into the thermostatic valve 43, through which the fuel passes as it isfed into the preheater tube 39. e

The valve body 61 is recessed in its` upper sideA and has an externally threaded,r hollow plug A84 mounted therein, with a plunger 85 extending therethrough having ahead on the lower end thereof in engagement with a spring diaphragm B6. A coil spring 81 is provided which surrounds the stem of the plunger 85, this member operating to open and close the kerosene fuel conduit 19 leading from the compartment 6| of the fuel tank 459.

The valve body 81 has a bracket 88 secured thereto by means of screws 89, 89, the said bracket 88 having downwardly extending portions 90 and 9|, respectively, integrally formed therewith and within which a rocker shaft 92 is mounted on the outer end of which is a lever 93 adapted to operate the rocker shaft 92. Securedto the bracket 88 at one side thereof is a pair of rocker arms 94 and 95, throughwhich the4 plungers 16 and 85, respectively, extend, these rocker arms extending over the edge of and being adapted to be engaged by pins 96 'and 91 mounted at each side of a .cam member 98 which is fixed upon the rocker shaft 92. These pins extend in opposite directions from the cam y member and are mounted at the sides thereof so that as a rocking action is imparted to the -cam member by the rotation of the shaft 92 the and 91 in the cam member 98 engage when the valves are operated for the admission of fuel from the tank.

indicator plate 99 is secured to the portion r90 of the bracket 88, and has stop pins |00, |00

at each side thereof adapted to limitv the movement of the lever 93 as it is moved fromside to side. The plate 99 at the center thereof has the word Off printed thereon, while at one side appears the word Start and at the opposite side the word Fuel", to indicate to the operator the correct operative position of the lever 93.

The connecting member 51 has an internally threaded projecting portion |0| at one` side thereof within which an externally threaded gland member |02 is fitted, the inner end-of this member being conical and adapted to extend into a port |03 formed in the. side of the generator tube I6, the wall of the port |03 being inclined outward to the same -degree as the conical point of the member' |02, so that a tight fuel connection is formed between the` glandY |02 and the generator tube I6. A bracket |04 extends downwardly from the connecting member 51 and has a screw |05 mounted therein by means of which the proper adjustment of the thermo-v static valve 43 is secured.

I n operation of the device, it will be understood that the fuel tank 59 is partially filled with gasoline or some other highly volatile fluid in the compartment 62, while kerosene is placed in the compartment 6| in the fuel tank .59. The

filler caps 65, 65 are placed in position, and a quantity of air is pumped into the fuel tank through the pump opening 63. This air initially passes into the compartment 62 and through the opening 64 into the compartment 6|, so that the pressure on each of these compartments is substantially equal. -Thereupon, if the operator desires to start the stove the levei- 93 is moved to the right (Fig. 2) to the Start position. 'I'he movement of the lever opens the valve member 12 allowing the gasoline to be forced by the air pressure in the tank 59 through the fuel pipe 56, the nipple |02 into the front end of the generator tube I6. 'Ihe valve needle 28 in the generator tube inthe meantime has been opened, allowing the gasoline to rpass through the tip 29 into the Vcurved section I4 of the mixing tube I0, which in effect sprays 'the gasoline into the mixing tube, at the same time drawing in a supply of air past the shutters 20 and into the pipes I9, so that a combustible mixture is formed in the curved end of the mixing tube I0. 'I'his mixture is forced on through the mixing tube,

becoming more thoroughly mixed as it reaches the manifold II, and the valve controlled bythe device 3| is opened admitting the mixture to the master burner 44, where the mixture is lighted by the operator.

In the meantime, a portion of the mixture is passing through the lava grids 22 and into the i'lash tube 52 which, becoming filled with the combustible mixture, is ignited at the end adjacent the burner 44 and-in turn ignites the mixture passing through the lava grids 22 forming the-heater burners on the upper side of the mixing tube I0. The flames from these burners and heat produced thereby pass directly against the generator tube I6 and preheater tube 39, heating these tubes and incidentally facilitating the conversionv of the gasoline into a gaseous fuel. The stove is allowed to burn for a short period of time, say for two minutes, during which time the generator tube I6 and the preheater tube 39 have become heated, and the expansion of the generator tube I6 has caused the thermostatic valve 43 to open, and at the expiration of this period plate 99 or over the Word Fue1". In this position the valve 12 controlling the flow of gasoline is shut off and the valve 8| at the opposite side of the valve body 61 is opened, allowing the kerf osene to pass through the valve 8|, the fuel pipe 53, through the thermostatic valve 43 into the fuel pipe 42, into the preheater tube 39, follows the spiral channel therein and passes through the port 4| into the generator tube |6 where it follows the spiral channel and is converted into a vapor and passesthrough the tip 29 into the mixing tube where it is mixed with a quantity of air passing into the mixing tube, and follows the same course to the master burner heretofore described with respect to the gasoline. Thegenerator tube I6 has been heated to at least a cherry red in the meantime, and the preheater tube has also become quite hot although not lheated to quite suchva high degree as the generator tube I6.

Due to the fact that the fuel formed from the mixture of kerosene follows the mixture of fuel formed from the gasoline and becomes mixed therewith, the heater burners continue to burn and the mixture is supplied to the master burner quickly enough so that combustion at the'burner does not cease because of the change inthe fuel. The quantity of fuel passing into the mixing 'tube is controlled through the inlet valve in the tip 29 and after combustion is initiated in the master burner, this burner can be shut off and the valves opened to the other burners and they ignite in the same manner as ordinary gas stoves.

When the operation of the stove is complete the operator returns the lever 93 to the VOif position, in which position both the gasoline and kersosene valves are closed to prevent the leakage of fuel into the generator mechanism. In this manner combustion of the stove is initiated, and to continue it is only necessary to keep a predetermined amount of air in the chamber through the air pump so as to supply the fuel tank with adequate pressure to force the fuel through the valve and fuel conduits into the mix- 'ng tube and into the generator.

While I have described more or less precisely the details of construction, I do not wish to be understood as limiting myself thereto, as I contemplate changes in form and the proportion of parts and the substitution of equivalents as circumstances may suggest or render expedient without departing from the spirit or scope of my invention.

I claim:

1. A kerosene vapor stove comprising, in combination, a mixing tube, heater burners associated with said mixing tube, a manifold to which said mixing tube is connected, stove burners connected to said manifold, a generator tube connected to said mixing tube extendingparallel with said mixing tube and extending over the heater burners, a needle valve in said generator tube, a preheater tube extending parallel with said generator tube and over the heater burners, the preheater tube having an intake end and a discharge end, the discharge end being directly connected to the generator tube at a point spaced from the mixing tube, a pressure fuel tank having ,a plurality of compartments therein, a fuel conduit leading from one of said pressure tank compartments direct to the generator tube, a second fuel conduit leading to the intake end of said preheater tube, valves in said fuel conduits, and common control means for said valves Whereby one only of said valves may be opened at one time.

2.A A kerosene vapor stove comprising, in combination, a mixing tube, heater burners associated with said mixing tube, a manifold to which said mixing tube is connected, stove burners connected to said manifold, a generator tube connected to said mixing tube, extending parallel with said mixing tube and extending over the heater burners, a needle valve in said generator tube, a preheater tube extending parallel with said generator tube and over the heater burners, the preheater tube having an intake end and a discharge end, the discharge endl being directly connected to the generator tube at a point spaced from the mixing tube, a pressure fuel tank having a plurality of compartments therein, a fuel conduit leading from one of said pressure tank compartments direct to the generator tube, a

second fuel conduit leading to the intake end of said preheater tube, a thermostatic valve mounted in the conduit leading to the preheater tube, valves in said fuel conduits, and common control means for said valves whereby one only of said valvesm-ay be openedl at one time.

3. A kerosene vapor stove comprising, in combination, a mixing tube, heater burners associatedl with said mixing tube, a manifold to which said mixing tube is connected, stove burners connected to said manifold, a generator tube connected to said mixing tube extending parallel with said mixing tube and extending over the heater burners, a needle valve in said generator tube, a preheater tube extending parallel with said generator tube and over the heater burners, the preheater tube having an intake end and a discharge end, the discharge end being directly connected to the generator tube at a point spaced from the mixingv tube, a pressure fuel tank having a plurality ofl compartments therein, a fuel conduit leading from one of said pressure tank compartments direct to the generator tube, a second fuel conduit leading to the intake end of said preheater tube, a thermostatic valve mounted inv CERTIFCATE oF CORRECTION. g Patent No. 2,161,118. l Y 'June 6, 41959.

ANTON J; YEAGER.

It is hereby certified that error appears in the printed specification of the abovenumbered patent requiring correction as follows: Page h, first column, lines LLL and h5, for the words "mixing tube and into the generator" read generator tube and into the mixing tube; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 25th day of July, A. D. 1959.

. Henry Van Arsdale, (Seal) Acting Commissioner of' Patents. 

